Table 1.

Distribution of key variables in the analyses by sleep duration

Variablea,b	Sleep duration, h				P Value	No.
	≤ 5	6	7	8+
Age, ya	46.2	44.9	44.2	44.0	< 0.001	10,264
BMI, kg/m2a	25.4	25.0	24.4	24.5	< 0.001	10,251
Total cholesterol, mmol/La	6.04	5.98	5.94	5.95	0.22	10,221
Incident CHDb
All	18.0	14.7	12.4	12.3	< 0.001	9841
Validated	10.4	7.9	7.4	7.6	0.14	10,155
More than usual “Lost Sleep over Worry”b	31.1	17.5	12.5	10.6	< 0.001	10,234
More than usual “Restless Disturbed Nights”b	38.7	26.6	18.8	16.4	< 0.001	10,232
Womenb	44.5	32.6	30.7	38.1	< 0.001	10,264
Non-White ethnicityb	16.3	10.9	9.0	15.2	< 0.001	10,264
Current smokersb	23.3	20.4	17.4	16.5	< 0.001	10,256
Hypertensiveb	13.1	8.7	7.2	8.1	< 0.001	10,256
Diabetesb	1.9	0.8	0.9	0.9	0.15	10,191
Poor self-rated healthb	12.0	5.3	4.2	5.3	< 0.001	10,230
Heavy drinkersb	16.7	16.4	16.0	13.3	< 0.05	10,173
No vigorous exerciseb	66.4	59.3	54.3	59.8	< 0.001	9925
No moderate exerciseb	27.1	16.5	13.8	17.2	< 0.001	10,037
< Recommended daily fresh fruit – vegetable intakeb	45.2	43.1	31.3	40.2	0.08	10,235

^aData are presented as mean or

^bpercentage.

BMI refers to body mass index; CHD, coronary heart disease.